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相关概念视频

The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

42.0K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

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The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
35.4K
Molecular Orbital Theory I02:35

Molecular Orbital Theory I

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Overview of Molecular Orbital Theory
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

1.7K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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MO Theory and Covalent Bonding02:40

MO Theory and Covalent Bonding

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The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
10.3K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.0K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
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Updated: Jun 9, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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一个基于合集群理论的静态量子嵌入方案.

Avijit Shee1, Fabian M Faulstich2, K Birgitta Whaley1,3

  • 1Department of Chemistry, University of California, Berkeley, California 94720, USA.

The Journal of chemical physics
|October 24, 2024
PubMed
概括
此摘要是机器生成的。

我们介绍了MP-CC,这是一种新的量子嵌入方法,它将高水平合集群 (CC) 理论与低水平的Møller-Plesset (MP) 扰动结合起来,大大提高了化学模拟的计算效率和准确性.

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科学领域:

  • 量子化学是一种量子化学.
  • 计算化学是一种计算化学.
  • 理论化学是一种理论化学.

背景情况:

  • 合集群 (CC) 理论提供了高精度,但在计算上昂贵.
  • 量子嵌入方法旨在通过对待系统的不同部分以不同的理论水平来降低计算成本.
  • 之前的混合方法结合了Møller-Plesset (MP) 和CC方法,但有局限性.

研究的目的:

  • 开发一种新的静态量子嵌入方案,称为MP-CC.
  • 通过将高水平CC用于活性片段和低水平MP用于环境的组合来有效计算分子性质.
  • 通过准特定的分子碎片和引入环境放松机制,改进现有的混合MP-CC方法.

主要方法:

  • 开发了一个静态量子嵌入方案 (MP-CC).
  • 运用高层次的CC理论对活性片段和低层次的MP扰动对环境.
  • 在环境中内置轨道放松,以提高准确性.
  • 利用局部键作为活性碎片来研究键断裂和扭转.

主要成果:

  • MP-CC在潜在能量曲线和热化学反应能量方面表现出有效性.
  • 在环境中的轨道放松显著改善了结果.
  • 在亚甲中实现了N=N键断的准确计算,并在布他中实现了C-C键扭转.
  • 精度随着碎片希尔伯特空间大小的增加而提高,接近完全的CC精度.

结论:

  • MP-CC方法为量子化学计算提供了一种计算效率高且准确的方法.
  • 轨道放松和碎片希尔伯特空间大小对于实现高精度至关重要.
  • MP-CC为研究复杂化学系统提供了一个有前途的框架.